Zero modes of local operators in 2d CFT on a cylinder

Zero modes of local operators in 2d CFT on a cylinder
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圆柱体上 2d CFT 中局部算子的零模式

DOI:
10.1007/jhep07(2020)172
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发表时间:
2020
影响因子:
5.4
通讯作者:
Solovyev, Dmitry
Solovyev, Dmitry
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Dymarsky, Anatoly;Pavlenko, Kirill;Solovyev, Dmitry

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二维CFTS中本征态热化假设(ETH)的研究需要计算高能本征态中局域算符的期望值。这可以通过用Virasoro代数生成器来表示这些算子的零模来有效地完成。在这篇文章中,我们提供了一个教学介绍,解释如何用解析的方式或使用计算机代数来执行这种计算。我们通过一些例子说明零模的计算,并列出真空族中所有维度小于或等于8的局域算符的显式表达式。最后,我们利用Virasoro代数生成元,给出了量子KdV生成元Q7的显式表达式。所得结果可用于中心电荷有限值的乙二胺的定量研究。
Studies of Eigenstate Thermalization Hypothesis (ETH) in two-dimensional CFTs call for calculation of the expectation values of local operators in highly excited energy eigenstates. This can be done efficiently by representing zero modes of these operators in terms of the Virasoro algebra generators. In this paper we present a pedagogical introduction explaining how this calculation can be performed analytically or using computer algebra. We illustrate the computation of zero modes by a number of examples and list explicit expressions for all local operators from the vacuum family with the dimension of less or equal than eight. Finally, we derive an explicit expression for the quantum KdV generator Q 7 in terms of the Virasoro algebra generators. The obtained results can be used for quantitative studies of ETH at finite value of central charge.
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